Fuel supply device for engineering vehicles

Abstract

The invention belongs to the technical field of engineering vehicles and relates to an oil supply device for an engineering vehicle. The oil supply device comprises an oil tank, a shuttle valve, an oil pump, a priority valve and a working device, wherein the oil tank is used for storing high-pressure hydraulic oil and low-pressure hydraulic oil; the shuttle valve is used for conveying the high-pressure hydraulic oil or the low-pressure hydraulic oil to the oil pump according to the oil condition in the oil tank; the oil pump is used for conveying the high-pressure hydraulic oil or high-pressure hydraulic oil which is formed after the low-pressure hydraulic oil is pressurized to the priority valve; the priority valve is used for conveying the high-pressure hydraulic oil to the working device, and conveying the redundant high-pressure hydraulic oil to the oil tank according to the pressure of an oil path; and the working device is used for conveying low-pressure hydraulic oil which is formed after the working of the high-pressure hydraulic oil to the oil tank. Through the oil supply device, the redundant high-pressure hydraulic oil can be conveyed to and stored in the oil tank; whenthe working device requires hydraulic oil again, the high-pressure hydraulic oil stored in the oil tank can be conveyed, and then energy required for the pressurization of the oil pump can be reduced;and furthermore, the time required for supplying the high-pressure hydraulic oil to the working device can be shortened, and then the efficiency of oil supply to the engineering vehicle can be improved.

Description

technical field [0001] The invention belongs to the technical field of engineering vehicles, in particular to an oil supply device for engineering vehicles. Background technique [0002] Engineering vehicles, especially forklifts, mostly use hydraulic systems to provide driving force. In the hydraulic systems of forklifts in the prior art, most of them use quantitative pumps and oil tanks with a single storage space. When the high-pressure hydraulic oil provided by the quantitative pumps meets the working requirements In the case of device demand and continuous supply of high-pressure hydraulic oil, the high-pressure hydraulic oil that cannot be used by the working device at this time is redundant for the hydraulic system of the forklift, and the excess high-pressure hydraulic oil will be returned directly to the oil tank. [0003] However, because the oil tank of the forklift hydraulic system is a single storage space, when the high-pressure hydraulic oil returns to the oil...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an oil supply device for engineering vehicles in view of the defects that existing engineering vehicles cannot effectively use high-pressure hydraulic oil, resulting in energy waste and low efficiency

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